1/* 2 * arch/s390/appldata/appldata_os.c 3 * 4 * Data gathering module for Linux-VM Monitor Stream, Stage 1. 5 * Collects misc. OS related data (CPU utilization, running processes). 6 * 7 * Copyright (C) 2003,2006 IBM Corporation, IBM Deutschland Entwicklung GmbH. 8 * 9 * Author: Gerald Schaefer <gerald.schaefer@de.ibm.com> 10 */ 11 12#define KMSG_COMPONENT "appldata" 13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15#include <linux/module.h> 16#include <linux/init.h> 17#include <linux/slab.h> 18#include <linux/errno.h> 19#include <linux/kernel_stat.h> 20#include <linux/netdevice.h> 21#include <linux/sched.h> 22#include <asm/appldata.h> 23#include <asm/smp.h> 24 25#include "appldata.h" 26 27 28#define LOAD_INT(x) ((x) >> FSHIFT) 29#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) 30 31/* 32 * OS data 33 * 34 * This is accessed as binary data by z/VM. If changes to it can't be avoided, 35 * the structure version (product ID, see appldata_base.c) needs to be changed 36 * as well and all documentation and z/VM applications using it must be 37 * updated. 38 * 39 * The record layout is documented in the Linux for zSeries Device Drivers 40 * book: 41 * http://oss.software.ibm.com/developerworks/opensource/linux390/index.shtml 42 */ 43struct appldata_os_per_cpu { 44 u32 per_cpu_user; /* timer ticks spent in user mode */ 45 u32 per_cpu_nice; /* ... spent with modified priority */ 46 u32 per_cpu_system; /* ... spent in kernel mode */ 47 u32 per_cpu_idle; /* ... spent in idle mode */ 48 49 /* New in 2.6 */ 50 u32 per_cpu_irq; /* ... spent in interrupts */ 51 u32 per_cpu_softirq; /* ... spent in softirqs */ 52 u32 per_cpu_iowait; /* ... spent while waiting for I/O */ 53 54 /* New in modification level 01 */ 55 u32 per_cpu_steal; /* ... stolen by hypervisor */ 56 u32 cpu_id; /* number of this CPU */ 57} __attribute__((packed)); 58 59struct appldata_os_data { 60 u64 timestamp; 61 u32 sync_count_1; /* after VM collected the record data, */ 62 u32 sync_count_2; /* sync_count_1 and sync_count_2 should be the 63 same. If not, the record has been updated on 64 the Linux side while VM was collecting the 65 (possibly corrupt) data */ 66 67 u32 nr_cpus; /* number of (virtual) CPUs */ 68 u32 per_cpu_size; /* size of the per-cpu data struct */ 69 u32 cpu_offset; /* offset of the first per-cpu data struct */ 70 71 u32 nr_running; /* number of runnable threads */ 72 u32 nr_threads; /* number of threads */ 73 u32 avenrun[3]; /* average nr. of running processes during */ 74 /* the last 1, 5 and 15 minutes */ 75 76 /* New in 2.6 */ 77 u32 nr_iowait; /* number of blocked threads 78 (waiting for I/O) */ 79 80 /* per cpu data */ 81 struct appldata_os_per_cpu os_cpu[0]; 82} __attribute__((packed)); 83 84static struct appldata_os_data *appldata_os_data; 85 86static struct appldata_ops ops = { 87 .name = "os", 88 .record_nr = APPLDATA_RECORD_OS_ID, 89 .owner = THIS_MODULE, 90 .mod_lvl = {0xF0, 0xF1}, /* EBCDIC "01" */ 91}; 92 93 94/* 95 * appldata_get_os_data() 96 * 97 * gather OS data 98 */ 99static void appldata_get_os_data(void *data) 100{ 101 int i, j, rc; 102 struct appldata_os_data *os_data; 103 unsigned int new_size; 104 105 os_data = data; 106 os_data->sync_count_1++; 107 108 os_data->nr_threads = nr_threads; 109 os_data->nr_running = nr_running(); 110 os_data->nr_iowait = nr_iowait(); 111 os_data->avenrun[0] = avenrun[0] + (FIXED_1/200); 112 os_data->avenrun[1] = avenrun[1] + (FIXED_1/200); 113 os_data->avenrun[2] = avenrun[2] + (FIXED_1/200); 114 115 j = 0; 116 for_each_online_cpu(i) { 117 os_data->os_cpu[j].per_cpu_user = 118 cputime_to_jiffies(kstat_cpu(i).cpustat.user); 119 os_data->os_cpu[j].per_cpu_nice = 120 cputime_to_jiffies(kstat_cpu(i).cpustat.nice); 121 os_data->os_cpu[j].per_cpu_system = 122 cputime_to_jiffies(kstat_cpu(i).cpustat.system); 123 os_data->os_cpu[j].per_cpu_idle = 124 cputime_to_jiffies(kstat_cpu(i).cpustat.idle); 125 os_data->os_cpu[j].per_cpu_irq = 126 cputime_to_jiffies(kstat_cpu(i).cpustat.irq); 127 os_data->os_cpu[j].per_cpu_softirq = 128 cputime_to_jiffies(kstat_cpu(i).cpustat.softirq); 129 os_data->os_cpu[j].per_cpu_iowait = 130 cputime_to_jiffies(kstat_cpu(i).cpustat.iowait); 131 os_data->os_cpu[j].per_cpu_steal = 132 cputime_to_jiffies(kstat_cpu(i).cpustat.steal); 133 os_data->os_cpu[j].cpu_id = i; 134 j++; 135 } 136 137 os_data->nr_cpus = j; 138 139 new_size = sizeof(struct appldata_os_data) + 140 (os_data->nr_cpus * sizeof(struct appldata_os_per_cpu)); 141 if (ops.size != new_size) { 142 if (ops.active) { 143 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 144 APPLDATA_START_INTERVAL_REC, 145 (unsigned long) ops.data, new_size, 146 ops.mod_lvl); 147 if (rc != 0) 148 pr_err("Starting a new OS data collection " 149 "failed with rc=%d\n", rc); 150 151 rc = appldata_diag(APPLDATA_RECORD_OS_ID, 152 APPLDATA_STOP_REC, 153 (unsigned long) ops.data, ops.size, 154 ops.mod_lvl); 155 if (rc != 0) 156 pr_err("Stopping a faulty OS data " 157 "collection failed with rc=%d\n", rc); 158 } 159 ops.size = new_size; 160 } 161 os_data->timestamp = get_clock(); 162 os_data->sync_count_2++; 163} 164 165 166/* 167 * appldata_os_init() 168 * 169 * init data, register ops 170 */ 171static int __init appldata_os_init(void) 172{ 173 int rc, max_size; 174 175 max_size = sizeof(struct appldata_os_data) + 176 (NR_CPUS * sizeof(struct appldata_os_per_cpu)); 177 if (max_size > APPLDATA_MAX_REC_SIZE) { 178 pr_err("Maximum OS record size %i exceeds the maximum " 179 "record size %i\n", max_size, APPLDATA_MAX_REC_SIZE); 180 rc = -ENOMEM; 181 goto out; 182 } 183 184 appldata_os_data = kzalloc(max_size, GFP_KERNEL | GFP_DMA); 185 if (appldata_os_data == NULL) { 186 rc = -ENOMEM; 187 goto out; 188 } 189 190 appldata_os_data->per_cpu_size = sizeof(struct appldata_os_per_cpu); 191 appldata_os_data->cpu_offset = offsetof(struct appldata_os_data, 192 os_cpu); 193 194 ops.data = appldata_os_data; 195 ops.callback = &appldata_get_os_data; 196 rc = appldata_register_ops(&ops); 197 if (rc != 0) 198 kfree(appldata_os_data); 199out: 200 return rc; 201} 202 203/* 204 * appldata_os_exit() 205 * 206 * unregister ops 207 */ 208static void __exit appldata_os_exit(void) 209{ 210 appldata_unregister_ops(&ops); 211 kfree(appldata_os_data); 212} 213 214 215module_init(appldata_os_init); 216module_exit(appldata_os_exit); 217 218MODULE_LICENSE("GPL"); 219MODULE_AUTHOR("Gerald Schaefer"); 220MODULE_DESCRIPTION("Linux-VM Monitor Stream, OS statistics"); 221